gamort / my_indexr

A tool that outputs SQL commands for dropping and recreating indexes on MySQL databases / tables.

my_indexr

About

my_indexr is a tool that outputs SQL commands for dropping and recreating indexes on MySQL databases / tables.

Features include:

• Process only certain tables
• Process non-primary or both normal and primary indexes
• Correctly handles:
  • Primary key indexes
  • Compound key / multi-column indexes
  • Index types (BTREE, etc)
  • Prefix lengths
  • Auto_increment columns, which MUST be a key (my_indexr skips indexes with these columns in them)

Usage

From the --help:

Usage: ./my_indexr [option] <database>

Show SQL queries for dropping and recreating indexes. (It does not actually
run the queries)

Options:
  -h, --help            show this help message and exit
  -u USER               Username
  -H HOST               Host
  -P PORT               Port
  -p                    Ask for passwd
  --passwd=PASSWD       Password (use -p to ask)
  --pw-from-stdin       Read password from STDIN
  -t TABLES, --tables=TABLES
                        Comma-separated list of tables to process
  --primary             Also process primary keys

Example usage:

# Generate SQL for dropping/creating indexes on `mydb`:
$ ./indexr.py -u root -p mydb > mydb_idx.sql

# Drop the indexes
$ grep -e "^DROP" mydb_idx.sql | mysql -u root -p mydb

# Recreate the indexes
$ grep -e "^CREATE" mydb_idx.sql | mysql -u root -p mydb

This is what the output of my_indexr looks like:

DROP INDEX `location` ON `idx_tst_innodb_basic`;
DROP INDEX `name_age` ON `idx_tst_innodb_basic`;
DROP INDEX `email` ON `idx_tst_innodb_basic`;
DROP INDEX `PRIMARY` ON `idx_tst_innodb_compkey`;
CREATE  INDEX `location` USING BTREE ON `idx_tst_innodb_basic` (`location_id`);
CREATE  INDEX `name_age` USING BTREE ON `idx_tst_innodb_basic` (`name`(40),`age`);
CREATE UNIQUE INDEX `email` USING BTREE ON `idx_tst_innodb_basic` (`email`);
ALTER TABLE `idx_tst_innodb_compkey` ADD PRIMARY KEY (`last_name`,`first_name`);

Bugs

There may still be edge-cases which are not handled properly. If you encounter such an edge-case, please notify me. Include a schema-dump (--no-data please).

License

(MIT Liencese)

Copyright (C) 2014 Ferry Boender

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.